US7682729B2 - Package structure of electric storage cells - Google Patents

Package structure of electric storage cells Download PDF

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Publication number
US7682729B2
US7682729B2 US11/719,784 US71978405A US7682729B2 US 7682729 B2 US7682729 B2 US 7682729B2 US 71978405 A US71978405 A US 71978405A US 7682729 B2 US7682729 B2 US 7682729B2
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frame body
electric storage
sealing portion
cell
accommodating
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US11/719,784
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US20090226804A1 (en
Inventor
Masaki Komuro
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Subaru Corp
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Fuji Jukogyo KK
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/42—Grouping of primary cells into batteries
    • H01M6/46—Grouping of primary cells into batteries of flat cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H01G11/76—Terminals, e.g. extensions of current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/80—Gaskets; Sealings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/04—Electrodes or formation of dielectric layers thereon
    • H01G9/06—Mounting in containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/08—Housing; Encapsulation
    • H01G9/10—Sealing, e.g. of lead-in wires
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/26—Structural combinations of electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices with each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/258—Modular batteries; Casings provided with means for assembling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H01M50/529—Intercell connections through partitions, e.g. in a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/13—Energy storage using capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a package structure of electric storage cells, the package structure increasing the shock resistance of the electric storage cells while downsizing the package.
  • flat electric storage cells having a substantially rectangular planar shape such as a lithium ion secondary battery or an electric double layer capacitor
  • a lithium ion secondary battery or an electric double layer capacitor have been put to practical use, and are regarded as promising as a power source for various equipment because of their high energy density, miniaturizability, easy maintenance, and the like.
  • planar electric storage cells are often used as an assembled cell that is packaged by laminating a plurality of the electric storage cells.
  • the electric storage cells are installed on a hybrid electric vehicle, an electric vehicle, or the like as a power source, it is necessary to ensure their durability to withstand vibrations.
  • Japanese Unexamined Patent Application Publication No. 2003-157813 discloses a technique for increasing the vibration-isolation effect of an assembled cell by preventing an external case that is a support member for unit cells from reaching a resonance point in a real usage region, by shifting a natural frequency of the assembled cell to the higher frequency side.
  • planar electric storage cells When the planar electric storage cells are packaged, there is a case where individual electric storage cells are each accommodated in a frame body, and a plurality of the frame bodies each having accommodated the electric storage cell is constituted as an assembled cell.
  • accommodating the planar cell into the frame body it is possible to adopt, for example, a structure wherein one frame body is divided into two members, and after the two members have been opposed to each other, a storage portion of the electric storage cell and a sealing portion are clamped by pressing them planarly.
  • the size of the package increases by a space for fixing the sealing portion, and in addition, there is a possibility that the storage portion with a relatively large weight and the sealing portion with a relatively light weight will move at mutually different frequencies or amplitudes from each other, so that a stress might concentrate on the boundary portion between the storage portion and the sealing portion, resulting in a reduced durability.
  • the thickness of the storage portion and that of the sealing portion vary due to dimension deviations among individual electric storage cells, it is impossible to clamp the storage portion and the sealing portion by simultaneously pressing them, leading to a reduction in shock resistance.
  • the present invention has been made in view of the above-described circumstances.
  • the object of the present invention is to provide a package structure of electric storage cells, the package structure being capable of increasing the shock resistance of the electric storage cells while downsizing the package.
  • the present invention provides a package structure of electric storage cells, the package structure being packaged by accommodating the planar-shaped electric storage cells each of which has a storage portion and a sealing portion that seals the storage portion extendedly arranged around the storage portion in frame bodies, the package structure including a first frame body for pressing the storage portion from one surface side thereof; a second frame body opposed to the first frame body for pressing the storage portion from the other surface side thereof; and a holding structure is provided in the first frame body and the second frame body, the holding structure being for accommodating the sealing portion in a deflected state and being fit in the pressing direction of the storage portion in a state where the ends of the sealing portion are clamped.
  • the holding structure can be constituted by a gap for accommodating the sealing portion in a bent state, and wall surface portions being fit in the pressing direction of the storage portion in a state where the ends of the sealing portion are clamped.
  • FIG. 1 is a perspective view of a storage capacitor package.
  • FIG. 2 is a perspective view of electric storage cells connected in series.
  • FIG. 3 is a sectional view taken along a line A-A of FIG. 1 .
  • FIG. 4 is diagram showing a clamping state when a sealing portion is longer than a standard size.
  • FIG. 5 is diagram showing a clamping state when the sealing portion is shorter than the standard size.
  • FIG. 6 is a diagram showing another holding structure of the electric storage cell.
  • FIG. 7 is a diagram showing still another holding structure of the electric storage cell.
  • FIGS. 1 to 7 concern the embodiment of the present invention.
  • FIG. 1 is a perspective view of a storage capacitor package
  • FIG. 2 is a perspective view of electric storage cells connected in series
  • FIG. 3 is a sectional view taken along a line A-A of FIG. 1
  • FIG. 4 is diagram showing a clamping state when a sealing portion is longer than a standard size
  • FIG. 5 is diagram showing a clamping state when the sealing portion is shorter than the standard size
  • FIG. 6 is a diagram showing another holding structure of the electric storage cell
  • FIG. 7 is a diagram showing still another holding structure of the electric storage cell.
  • reference numeral 1 denotes a storage capacitor package used as power source unit, for example, in an electric vehicle (EV) or a hybrid electric vehicle (HEV).
  • This storage capacitor package 1 is mainly composed of a plurality (in the illustrated example, five pieces) of flat electric storage cells 5 (refer to FIG. 2 ) with a substantially rectangular planar shape, and an external case 2 for accommodating the electric storage cells 5 .
  • the external case 2 is constituted, for example, by laminating a plurality (in the illustrated example, five pieces) of cell binders 15 each constituted of a resin-made flat frame body with a substantially rectangular planar shape.
  • the electric storage cell 5 is a flat storage capacitor having a substantially rectangular planar shape, such as a lithium ion secondary battery or an electric double layer capacitor.
  • the electric storage cells 5 are ones configured by enclosing and sealing a laminated body of internal electrodes and an electrolytic layer, for example, by a sheet-shaped laminated film formed by insulation-coating the surface of an aluminum-base metal layer with a resin layer.
  • the electric storage cells 5 each include a rectangular-shaped storage portion 6 that embraces a storage element comprising the laminated body of the electrolytic layer and the electrodes, and that is formed somewhat thicker than peripheries; a sealing portion 7 extendedly arranged in a sheet shape around the storage portion 6 ; and two metal tabs 8 and 9 that serve as positive and negative electrode terminals, respectively, and that are exposed from both ends of the sealing portion 7 .
  • the electric storage cells 5 are serially connected in advance by terminal connections of the tabs 8 and 9 .
  • a cell string 5 A is formed by these serially connected electric storage cells, and accommodated in the external case 2 in a state of being arranged in a staggered configuration.
  • the direction in which the tabs 8 and 9 of the electric storage cell 5 are extended is referred to as a longitudinal direction
  • the direction orthogonal to the direction in which the tabs 8 and 9 of the electric storage cells 5 are extended is referred to as a lateral direction, as appropriate.
  • the cell binder 15 comprises a frame body 16 serving as a first frame body and a frame body 17 serving as a second frame body, and the electric storage cell 5 is accommodated between the one set of frame bodies 16 and 17 .
  • the frame body 16 of an arbitrary cell binder 15 and the frame body 17 of the other cell binder 15 abut against each other, and are connected by a fitting structure provided at four corner of the abutting surface.
  • two cylindrical pins 10 are installed in upright positions in the laminating direction, at both corners on the side where the tabs 8 and 9 are extended and exposed. Also, on the other side where the tab 9 of the electric storage cell 5 is extended and exposed, there are provided two holes 11 into which the pins 10 (i.e., the pins 10 of the other cell binder 15 ) are to be fitted.
  • the pins 10 and the holes 11 are provided also to an abutting surface of the other abutting surface of the frame body 17 , while they are not shown.
  • the pins 10 and holes 11 are disposed so that the positional relationship of the pins 10 with the holes 11 becomes reverse between the frame body 17 and the frame body 16 .
  • the pins 10 and the holes 11 of the frame body 17 of a predetermined cell binder 15 are fitted to the holes 11 and the pins 10 of the frame body 16 of the other cell binder 15 , whereby the cell binders 15 are fitted and connected to each other.
  • a plurality of locking grooves 10 a is provided in the outer peripheral surface of each of the pins 10 .
  • These locking grooves 10 a implement a retaining function with a predetermined strength (so-called a semi-lock structure) between the pin 10 and the hole 11 to be fitted thereto.
  • the electric storage cell 5 accommodated in the cell binder 15 is held by fitting of the frame bodies 16 and 17 in the laminating direction.
  • the holding structure of the electric storage cell 5 by the frame bodies 16 and 17 constitutes a dual holding structure composed of a structure for clamping the storage portion 6 serving as a cell body being pressed by the frame bodies 16 and 17 in the laminating direction, and a structure for fitting in the pressing direction (laminating direction) of the storage portion 6 in a state where the sealing portion 7 on both lateral sides of the storage portion 6 are bent and the ends thereof are clamped by the frame bodies 16 and 17 .
  • FIG. 3 which is a sectional view taken along the lateral line A-A in FIG. 1 , on the side of the frame body 16 to be fitted oppositely to the frame body 17 , a substantially rectangular-shaped accommodating portion 16 a with a bottom is opened for accommodating one surface side of the storage portion 6 of the electric storage cell 5 .
  • On both lateral sides of this accommodating portion 16 a there are provided groove-shaped fitting concave portions 16 b each having a predetermined depth in the laminating direction and a length larger than the width in the longitudinal direction of the sealing portion 7 .
  • An inner wall (wall portion) 16 c on the lateral outside of the fitting concave portion 16 b is flush with an inner wall (wall surface portion) of a projecting portion 16 d that forms a lateral frame portion of the frame body 16 and that is projected from the opening top surface of the accommodating portion 16 a , and as will be described below, this inner wall 16 c is set so as to clamp the sealing portion 7 of the electric storage cell 5 , in conjunction with the frame body 17 .
  • a substantially rectangular-shaped accommodating portion 17 a with a bottom is opened for accommodating the other surface side of the storage portion 6 of the electric storage cell 5 .
  • projecting portions 17 b each having an elongated shape in the longitudinal direction and a predetermined projection height in the laminating direction.
  • the projecting portion 17 b is formed into a substantially arcuate shape in the projection front end thereof.
  • An outer wall (wall portion) 17 c on the lateral outside of the projecting portion 17 b reaches the substantially flush level with the bottom surface of the accommodating portion 17 a , and connected to a step portion against which the front end surface of the projecting portion 16 d of the frame body 16 abuts.
  • the cell binder 15 with the above-described arrangement adopts a structure in which the frame bodies 16 and 17 are fitted to each other while clamping the sealing portion 7 of the electric storage cell 5 between the inner wall 16 c on the lateral outside of the fitting concave portion 16 b of the frame body 16 and the outer wall 17 c on the lateral outside of the projecting portion 17 b of the frame body 17 .
  • the present holding structure constitutes a wall portion that is capable of fitting the frame bodies 16 and 17 to each other in the pressing direction of the storage portion 6 in a state where the ends of the sealing portion 7 of the electric storage cell 5 are clamped.
  • the holding structure is set so that a gap is formed between the bottom of the fitting concave portion 16 b and the front end of the projecting portion 17 b .
  • the sealing portion 7 of the electric storage cell 5 is accommodated in a state of being deflected by bending.
  • the depth of the each of the accommodating portions 16 a and 17 a is set so that, when the front end surface of the projecting portion 16 d of the frame body 16 abuts against the step portion outside the projecting portion 17 b of the frame body 17 , the storage portion 6 of the electric storage cell 5 can be pressed/clamped by the bottom of the accommodating portion 16 a of the frame body 16 and that of the accommodating portion 17 a of the frame body 17 .
  • this holding structure is set so that, when the front end surface of the projecting portion 16 d of the frame body 16 abuts against the step portion outside the projecting portion 17 b of the frame body 17 , the side edge of the accommodating portion 16 a of the frame body 16 and that of the accommodating portion 17 a of the frame body 17 are opposed to each other with a predetermined distance therebetween so as not to press the base portion of the sealing portion 7 .
  • a lateral dimension D for clamping the sealing portion 7 can be made small as compared with that in a structure in which the sealing portion 7 is planarly clamped, thereby allowing the entire package to be downsized.
  • providing the sealing portion 7 with deflections allows movements of the electric storage cell 5 to be accommodated when vibrations are applied in the lateral direction (i.e., direction orthogonal to the laminating direction). This eliminates a possibility that the sealing portion 7 will be damaged by a shearing stress, and leads to durability to be improved.
  • the structure for clamping the sealing portion 7 of the electric storage cell 5 by providing the sealing portion 7 with deflections it is possible to accommodate a variation in the lateral length of the sealing portion 7 of each individual electric storage cell 5 . That is, even if there occurs a dimension error of the sealing portion 7 of the electric storage cell 5 relative to a standard value, there is no need to increase the dimension D of the cell binder 15 in response to the dimension error, but one can address the variation using the cell binder 15 of the unchanged dimension.
  • the width of the sealing portion 7 of the electric storage cell 5 has a plus error relative to the standard value, then, making longer the bending length of the sealing portion 7 to be accommodated in the gap between the bottom of the fitting concave portion 16 b of the frame body 16 and the front end of the projecting portion 17 b of the frame body 17 than an ordinary bending length, makes it possible to keep proper the length of the sealing portion 7 to be clamped between the inner wall 16 c of the fitting concave portion 16 b and the outer wall 17 c of the projecting portion 17 b , and to avoid malfunctions such as running-over of the sealing portion 7 to the outside by accommodating the plus error.
  • the width of the sealing portion 7 of the electric storage cell 5 has a minus error relative to the standard value, then, making shorter the bending length of the sealing portion 7 to be accommodated in the gap between the bottom of the fitting concave portion 16 b and the front end of the projecting portion 17 b than the ordinary bending length, makes it possible to ensure the length of the sealing portion 7 to be clamped between the inner wall 16 c of the fitting concave portion 16 b and the outer wall 17 c of the projecting portion 17 b , and to reliably hold the sealing portion 7 .
  • the holding structure in this embodiment has an independent structure in which the storage portion 6 and the sealing portion 7 are pressed/clamped in mutually different directions, and therefore, even if the storage portion 6 varies in the thickness, it is possible to simultaneously clamp the storage portion 6 and the sealing portion 7 , and to ensure a stable characteristic against vibrations during service by accurately providing a bearing stress to the storage portion 6 .
  • the frame bodies 16 and 17 constituting the cell binder 15 have the structure to fit to each other, and hence, when a plurality of cell binders 15 is laminated by accommodating the electric storage cells 5 between the frame bodies 16 and 17 , there is no possibility that the cell binders 15 will laterally deviate from each other. As a consequence, the assembling work of the storage capacitor package 1 is improved, thereby allowing productivity to be enhanced.
  • the above-described holding structure of the electric storage cell 5 can also be made a simplified structure shown in FIG. 6 or FIG. 7 . That is, it is possible to form a dual holding structure composed of a structure for clamping the storage portion 6 serving as the cell body in the laminating direction as in the case of the cell binder 15 , and a structure for clamping the sealing portion 7 in the direction substantially orthogonal to the laminating direction by bending the sealing portion 7 .
  • a cell binder 20 shown in FIG. 6 is fundamentally the same as the cell binder 15 in the holding structure of the electric storage cell 5 , but the cell binder 20 is low in the bending amount of the sealing portion 7 compared with the cell binder 15 .
  • the cell binder 20 comprises a frame body 21 serving as a first frame body that is made more shallow in the fitting concave portion 16 b of the frame body 16 , and a frame body 22 serving as a second frame body, the frame body 22 being to be fitted to the frame body 21 .
  • the frame body 21 includes a substantially rectangular-shaped accommodating portion 21 a with a bottom for accommodating one surface side of the storage portion 6 of the electric storage cell 5 ; taper-shaped guide portions 21 b that are provided on both sides of the accommodating portion 21 a and that are diverged from the opening top surface of the accommodating portion 21 a toward the laminating direction; and a side wall portion (wall surface portion) 21 c that is projected from the guide portion 21 b toward the laminating direction to thereby form a lateral frame portion of the frame body 21 .
  • the frame body 22 includes a substantially rectangular-shaped accommodating portion 22 a with a bottom for accommodating the other surface side of the storage portion 6 of the electric storage cell 5 ; taper-shaped guide portions 21 b that are provided on both sides of the accommodating portion 22 a and that are oppositely arranged so as to form a predetermined gap with respect to the guide portion 21 b of the frame body 21 ; and a side wall portion (wall surface portion) 22 c formed on the lateral outside of the guide portion 22 b.
  • the cell binder 20 accommodates the storage portion 6 of the electric storage cell 5 in the accommodating portion 21 a of the frame body 21 and the accommodating portion 22 a of the frame body 22 , and further accommodates the sealing portion 7 of the electric storage cell 5 in a gap between the guide portion 22 b of the frame body 21 and the guide portion 22 b of the frame body 22 , in a state of being provided with deflections by bending in the laminating direction.
  • the ends of the sealing portion 7 are each clamped between the inner wall surface of the side wall portion 21 c of the frame body 21 and the outer wall surface of the side wall portion 22 c of the frame body 22 , thereby fitting the frame bodies 21 and 22 to each other.
  • the area for accommodating the sealing portion 7 of the electric storage cell 5 is arcuately shaped.
  • the guide portions 21 b and 22 b are each arcuately shaped.
  • the cell binder 25 accommodates the storage portion 6 of the electric storage cell 5 in an accommodating portion 26 a of a frame body 26 serving as a first frame body, and an accommodating portion 27 a of a frame body 27 serving as a second frame body, and further accommodates the sealing portion 7 of the electric storage cell 5 in a gap formed between an arcuate guide portion 26 b of the frame body 26 and an arcuate guide portion 27 b of the frame body 27 , in a state of being provided with deflections by being arcuately bent in the laminating direction.
  • the ends of the sealing portion 7 are each clamped between the inner wall surface of a side wall portion (wall surface portion) 26 c of the frame body 26 and the outer wall surface of a side wall portion (wall surface portion) 27 c of the frame body 27 , thereby fitting the frame bodies 26 and 27 to each other.
  • the cell binders 20 and 25 In these cell binders 20 and 25 , the bending amount of the sealing portion 7 of the electric storage cell 5 is low. Therefore, as compared with the cell binder 15 , the cell binders 20 and 25 are somewhat small in the degree of tolerance for dimension error of the sealing portion 7 , but can reduce the load upon the sealing portion 7 .
  • the package structure of electric storage cells is not a structure in which the storage portion 6 of the electric storage cell 5 and the sealing portion 7 are planarly pressed/clamped in the same direction (laminating direction), but a structure in which the storage portion 6 is pressed/clamped in the laminating direction, and in which the ends of the sealing portion 7 are each pressed/clamped by the wall surfaces in the direction substantially orthogonal to the laminating direction in a state where the sealing portion 7 is provided with deflections.
  • This makes it possible to increase the shock resistance of the electric storage cells 5 while downsizing the package.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

A cell binder includes a frame body and a frame body. A storage portion of a electric storage cell are pressed/clamped by the bottom of an accommodating portion of the frame body and the bottom of an accommodating portion of the frame body. Also, a sealing portion of the electric storage cell is accommodated in a gap between the bottom of a fitting concave portion of the frame body 16 and the front end of a projecting portion of the other frame body, in a state of being deflected by bending, and the sealing portion is clamped between an inner wall of the fitting concave portion and an outer wall of the projecting portion, thereby fitting the frame bodies to each other. This makes it possible to reduce the size for clamping the sealing portion and to achieve the downsizing of the entire package. In addition, providing the sealing portion with deflections allows movements of the electric storage cell to be accommodated when vibrations are applied. This eliminates a possibility that the sealing portion will be damaged by a shearing stress, and leads to durability to be improved.

Description

CROSS-REFERENCE TO PRIOR APPLICATIONS
This is a U.S. national phase application under 35 U.S.C. § 371 of International Patent Application No. PCT/JP2005/021569 filed Nov. 24, 2005 and claims the benefit of Japanese Application No. 2004-341249 filed Nov. 25, 2004. The International Application was published in Japanese on Jun. 1, 2006 as International Publication No. WO/2006/057291 A1 under PCT Article 21(2), the content of both applications are incorporated herein in their entirety.
TECHNICAL FIELD
The present invention relates to a package structure of electric storage cells, the package structure increasing the shock resistance of the electric storage cells while downsizing the package.
BACKGROUND ART
In recent years, flat electric storage cells having a substantially rectangular planar shape, such as a lithium ion secondary battery or an electric double layer capacitor, have been put to practical use, and are regarded as promising as a power source for various equipment because of their high energy density, miniaturizability, easy maintenance, and the like.
Such planar electric storage cells are often used as an assembled cell that is packaged by laminating a plurality of the electric storage cells. When the electric storage cells are installed on a hybrid electric vehicle, an electric vehicle, or the like as a power source, it is necessary to ensure their durability to withstand vibrations.
For example, Japanese Unexamined Patent Application Publication No. 2003-157813 discloses a technique for increasing the vibration-isolation effect of an assembled cell by preventing an external case that is a support member for unit cells from reaching a resonance point in a real usage region, by shifting a natural frequency of the assembled cell to the higher frequency side.
When the planar electric storage cells are packaged, there is a case where individual electric storage cells are each accommodated in a frame body, and a plurality of the frame bodies each having accommodated the electric storage cell is constituted as an assembled cell. In this case, in accommodating the planar cell into the frame body, it is possible to adopt, for example, a structure wherein one frame body is divided into two members, and after the two members have been opposed to each other, a storage portion of the electric storage cell and a sealing portion are clamped by pressing them planarly.
However, in such a structure in which all electric storage cells are planarly fixed, the size of the package increases by a space for fixing the sealing portion, and in addition, there is a possibility that the storage portion with a relatively large weight and the sealing portion with a relatively light weight will move at mutually different frequencies or amplitudes from each other, so that a stress might concentrate on the boundary portion between the storage portion and the sealing portion, resulting in a reduced durability. In particular, when the thickness of the storage portion and that of the sealing portion vary due to dimension deviations among individual electric storage cells, it is impossible to clamp the storage portion and the sealing portion by simultaneously pressing them, leading to a reduction in shock resistance.
The present invention has been made in view of the above-described circumstances. The object of the present invention is to provide a package structure of electric storage cells, the package structure being capable of increasing the shock resistance of the electric storage cells while downsizing the package.
SUMMARY OF INVENTION
To solve the above-described object, the present invention provides a package structure of electric storage cells, the package structure being packaged by accommodating the planar-shaped electric storage cells each of which has a storage portion and a sealing portion that seals the storage portion extendedly arranged around the storage portion in frame bodies, the package structure including a first frame body for pressing the storage portion from one surface side thereof; a second frame body opposed to the first frame body for pressing the storage portion from the other surface side thereof; and a holding structure is provided in the first frame body and the second frame body, the holding structure being for accommodating the sealing portion in a deflected state and being fit in the pressing direction of the storage portion in a state where the ends of the sealing portion are clamped. Here, the holding structure can be constituted by a gap for accommodating the sealing portion in a bent state, and wall surface portions being fit in the pressing direction of the storage portion in a state where the ends of the sealing portion are clamped.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a storage capacitor package.
FIG. 2 is a perspective view of electric storage cells connected in series.
FIG. 3 is a sectional view taken along a line A-A of FIG. 1.
FIG. 4 is diagram showing a clamping state when a sealing portion is longer than a standard size.
FIG. 5 is diagram showing a clamping state when the sealing portion is shorter than the standard size.
FIG. 6 is a diagram showing another holding structure of the electric storage cell.
FIG. 7 is a diagram showing still another holding structure of the electric storage cell.
 DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIGS. 1 to 7 concern the embodiment of the present invention. Here, FIG. 1 is a perspective view of a storage capacitor package; FIG. 2 is a perspective view of electric storage cells connected in series; FIG. 3 is a sectional view taken along a line A-A of FIG. 1; FIG. 4 is diagram showing a clamping state when a sealing portion is longer than a standard size; FIG. 5 is diagram showing a clamping state when the sealing portion is shorter than the standard size; FIG. 6 is a diagram showing another holding structure of the electric storage cell; and FIG. 7 is a diagram showing still another holding structure of the electric storage cell.
In FIG. 1, reference numeral 1 denotes a storage capacitor package used as power source unit, for example, in an electric vehicle (EV) or a hybrid electric vehicle (HEV). This storage capacitor package 1 is mainly composed of a plurality (in the illustrated example, five pieces) of flat electric storage cells 5 (refer to FIG. 2) with a substantially rectangular planar shape, and an external case 2 for accommodating the electric storage cells 5. The external case 2 is constituted, for example, by laminating a plurality (in the illustrated example, five pieces) of cell binders 15 each constituted of a resin-made flat frame body with a substantially rectangular planar shape.
The electric storage cell 5 is a flat storage capacitor having a substantially rectangular planar shape, such as a lithium ion secondary battery or an electric double layer capacitor. As typified by a planar laminate type lithium ion secondary battery, the electric storage cells 5 are ones configured by enclosing and sealing a laminated body of internal electrodes and an electrolytic layer, for example, by a sheet-shaped laminated film formed by insulation-coating the surface of an aluminum-base metal layer with a resin layer.
That is, as shown in FIG. 2, the electric storage cells 5 each include a rectangular-shaped storage portion 6 that embraces a storage element comprising the laminated body of the electrolytic layer and the electrodes, and that is formed somewhat thicker than peripheries; a sealing portion 7 extendedly arranged in a sheet shape around the storage portion 6; and two metal tabs 8 and 9 that serve as positive and negative electrode terminals, respectively, and that are exposed from both ends of the sealing portion 7. In this embodiment, the electric storage cells 5 are serially connected in advance by terminal connections of the tabs 8 and 9. A cell string 5A is formed by these serially connected electric storage cells, and accommodated in the external case 2 in a state of being arranged in a staggered configuration.
Hereinafter, for convenience, the direction in which the tabs 8 and 9 of the electric storage cell 5 are extended is referred to as a longitudinal direction, and the direction orthogonal to the direction in which the tabs 8 and 9 of the electric storage cells 5 are extended is referred to as a lateral direction, as appropriate.
The cell binder 15 comprises a frame body 16 serving as a first frame body and a frame body 17 serving as a second frame body, and the electric storage cell 5 is accommodated between the one set of frame bodies 16 and 17. In such the cell binder 15, the frame body 16 of an arbitrary cell binder 15 and the frame body 17 of the other cell binder 15 abut against each other, and are connected by a fitting structure provided at four corner of the abutting surface.
In one abutting surface of a frame body 17 as shown in FIG. 1, two cylindrical pins 10 are installed in upright positions in the laminating direction, at both corners on the side where the tabs 8 and 9 are extended and exposed. Also, on the other side where the tab 9 of the electric storage cell 5 is extended and exposed, there are provided two holes 11 into which the pins 10 (i.e., the pins 10 of the other cell binder 15) are to be fitted. The pins 10 and the holes 11 are provided also to an abutting surface of the other abutting surface of the frame body 17, while they are not shown. Here, the pins 10 and holes 11 are disposed so that the positional relationship of the pins 10 with the holes 11 becomes reverse between the frame body 17 and the frame body 16.
That is, the pins 10 and the holes 11 of the frame body 17 of a predetermined cell binder 15, respectively, are fitted to the holes 11 and the pins 10 of the frame body 16 of the other cell binder 15, whereby the cell binders 15 are fitted and connected to each other. In this case, a plurality of locking grooves 10 a is provided in the outer peripheral surface of each of the pins 10. These locking grooves 10 a implement a retaining function with a predetermined strength (so-called a semi-lock structure) between the pin 10 and the hole 11 to be fitted thereto.
The electric storage cell 5 accommodated in the cell binder 15 is held by fitting of the frame bodies 16 and 17 in the laminating direction. The holding structure of the electric storage cell 5 by the frame bodies 16 and 17 constitutes a dual holding structure composed of a structure for clamping the storage portion 6 serving as a cell body being pressed by the frame bodies 16 and 17 in the laminating direction, and a structure for fitting in the pressing direction (laminating direction) of the storage portion 6 in a state where the sealing portion 7 on both lateral sides of the storage portion 6 are bent and the ends thereof are clamped by the frame bodies 16 and 17.
Specifically, as shown in FIG. 3, which is a sectional view taken along the lateral line A-A in FIG. 1, on the side of the frame body 16 to be fitted oppositely to the frame body 17, a substantially rectangular-shaped accommodating portion 16 a with a bottom is opened for accommodating one surface side of the storage portion 6 of the electric storage cell 5. On both lateral sides of this accommodating portion 16 a, there are provided groove-shaped fitting concave portions 16 b each having a predetermined depth in the laminating direction and a length larger than the width in the longitudinal direction of the sealing portion 7. An inner wall (wall portion) 16 c on the lateral outside of the fitting concave portion 16 b is flush with an inner wall (wall surface portion) of a projecting portion 16 d that forms a lateral frame portion of the frame body 16 and that is projected from the opening top surface of the accommodating portion 16 a, and as will be described below, this inner wall 16 c is set so as to clamp the sealing portion 7 of the electric storage cell 5, in conjunction with the frame body 17.
On the other hand, on the side of the frame body 17 to be fitted oppositely to the frame body 16, a substantially rectangular-shaped accommodating portion 17 a with a bottom is opened for accommodating the other surface side of the storage portion 6 of the electric storage cell 5. On both lateral sides of the accommodating portion 17 a, there are provided projecting portions 17 b each having an elongated shape in the longitudinal direction and a predetermined projection height in the laminating direction. The projecting portion 17 b is formed into a substantially arcuate shape in the projection front end thereof. An outer wall (wall portion) 17 c on the lateral outside of the projecting portion 17 b reaches the substantially flush level with the bottom surface of the accommodating portion 17 a, and connected to a step portion against which the front end surface of the projecting portion 16 d of the frame body 16 abuts.
As a holding structure for the sealing portion 7 of the electric storage cell 5, the cell binder 15 with the above-described arrangement adopts a structure in which the frame bodies 16 and 17 are fitted to each other while clamping the sealing portion 7 of the electric storage cell 5 between the inner wall 16 c on the lateral outside of the fitting concave portion 16 b of the frame body 16 and the outer wall 17 c on the lateral outside of the projecting portion 17 b of the frame body 17. Thereby, the present holding structure constitutes a wall portion that is capable of fitting the frame bodies 16 and 17 to each other in the pressing direction of the storage portion 6 in a state where the ends of the sealing portion 7 of the electric storage cell 5 are clamped. At this time, the holding structure is set so that a gap is formed between the bottom of the fitting concave portion 16 b and the front end of the projecting portion 17 b. In this gap, the sealing portion 7 of the electric storage cell 5 is accommodated in a state of being deflected by bending.
Also, in a holding structure for the storage portion 6 of the electric storage cell 5, the depth of the each of the accommodating portions 16 a and 17 a is set so that, when the front end surface of the projecting portion 16 d of the frame body 16 abuts against the step portion outside the projecting portion 17 b of the frame body 17, the storage portion 6 of the electric storage cell 5 can be pressed/clamped by the bottom of the accommodating portion 16 a of the frame body 16 and that of the accommodating portion 17 a of the frame body 17. Furthermore, this holding structure is set so that, when the front end surface of the projecting portion 16 d of the frame body 16 abuts against the step portion outside the projecting portion 17 b of the frame body 17, the side edge of the accommodating portion 16 a of the frame body 16 and that of the accommodating portion 17 a of the frame body 17 are opposed to each other with a predetermined distance therebetween so as not to press the base portion of the sealing portion 7.
As a result, a lateral dimension D for clamping the sealing portion 7 can be made small as compared with that in a structure in which the sealing portion 7 is planarly clamped, thereby allowing the entire package to be downsized. In addition, providing the sealing portion 7 with deflections allows movements of the electric storage cell 5 to be accommodated when vibrations are applied in the lateral direction (i.e., direction orthogonal to the laminating direction). This eliminates a possibility that the sealing portion 7 will be damaged by a shearing stress, and leads to durability to be improved.
Moreover, by adopting the structure for clamping the sealing portion 7 of the electric storage cell 5 by providing the sealing portion 7 with deflections, it is possible to accommodate a variation in the lateral length of the sealing portion 7 of each individual electric storage cell 5. That is, even if there occurs a dimension error of the sealing portion 7 of the electric storage cell 5 relative to a standard value, there is no need to increase the dimension D of the cell binder 15 in response to the dimension error, but one can address the variation using the cell binder 15 of the unchanged dimension.
For example, as shown in FIG. 4, if the width of the sealing portion 7 of the electric storage cell 5 has a plus error relative to the standard value, then, making longer the bending length of the sealing portion 7 to be accommodated in the gap between the bottom of the fitting concave portion 16 b of the frame body 16 and the front end of the projecting portion 17 b of the frame body 17 than an ordinary bending length, makes it possible to keep proper the length of the sealing portion 7 to be clamped between the inner wall 16 c of the fitting concave portion 16 b and the outer wall 17 c of the projecting portion 17 b, and to avoid malfunctions such as running-over of the sealing portion 7 to the outside by accommodating the plus error.
On the other hand, as shown in FIG. 5, if the width of the sealing portion 7 of the electric storage cell 5 has a minus error relative to the standard value, then, making shorter the bending length of the sealing portion 7 to be accommodated in the gap between the bottom of the fitting concave portion 16 b and the front end of the projecting portion 17 b than the ordinary bending length, makes it possible to ensure the length of the sealing portion 7 to be clamped between the inner wall 16 c of the fitting concave portion 16 b and the outer wall 17 c of the projecting portion 17 b, and to reliably hold the sealing portion 7.
In a structure in which the storage portion 6 and the sealing portion 7 are clamped by mutually different surfaces in the same direction (laminating direction), if the storage portion 6 varies in the thickness, there is a possibility that only one of the storage portion 6 and the sealing portion 7 can be pressed/clamped. However, the holding structure in this embodiment has an independent structure in which the storage portion 6 and the sealing portion 7 are pressed/clamped in mutually different directions, and therefore, even if the storage portion 6 varies in the thickness, it is possible to simultaneously clamp the storage portion 6 and the sealing portion 7, and to ensure a stable characteristic against vibrations during service by accurately providing a bearing stress to the storage portion 6.
Furthermore, the frame bodies 16 and 17 constituting the cell binder 15 have the structure to fit to each other, and hence, when a plurality of cell binders 15 is laminated by accommodating the electric storage cells 5 between the frame bodies 16 and 17, there is no possibility that the cell binders 15 will laterally deviate from each other. As a consequence, the assembling work of the storage capacitor package 1 is improved, thereby allowing productivity to be enhanced.
The above-described holding structure of the electric storage cell 5 can also be made a simplified structure shown in FIG. 6 or FIG. 7. That is, it is possible to form a dual holding structure composed of a structure for clamping the storage portion 6 serving as the cell body in the laminating direction as in the case of the cell binder 15, and a structure for clamping the sealing portion 7 in the direction substantially orthogonal to the laminating direction by bending the sealing portion 7.
A cell binder 20 shown in FIG. 6 is fundamentally the same as the cell binder 15 in the holding structure of the electric storage cell 5, but the cell binder 20 is low in the bending amount of the sealing portion 7 compared with the cell binder 15. The cell binder 20 comprises a frame body 21 serving as a first frame body that is made more shallow in the fitting concave portion 16 b of the frame body 16, and a frame body 22 serving as a second frame body, the frame body 22 being to be fitted to the frame body 21.
That is, the frame body 21 includes a substantially rectangular-shaped accommodating portion 21 a with a bottom for accommodating one surface side of the storage portion 6 of the electric storage cell 5; taper-shaped guide portions 21 b that are provided on both sides of the accommodating portion 21 a and that are diverged from the opening top surface of the accommodating portion 21 a toward the laminating direction; and a side wall portion (wall surface portion) 21 c that is projected from the guide portion 21 b toward the laminating direction to thereby form a lateral frame portion of the frame body 21. On the other hand, the frame body 22 includes a substantially rectangular-shaped accommodating portion 22 a with a bottom for accommodating the other surface side of the storage portion 6 of the electric storage cell 5; taper-shaped guide portions 21 b that are provided on both sides of the accommodating portion 22 a and that are oppositely arranged so as to form a predetermined gap with respect to the guide portion 21 b of the frame body 21; and a side wall portion (wall surface portion) 22 c formed on the lateral outside of the guide portion 22 b.
The cell binder 20 accommodates the storage portion 6 of the electric storage cell 5 in the accommodating portion 21 a of the frame body 21 and the accommodating portion 22 a of the frame body 22, and further accommodates the sealing portion 7 of the electric storage cell 5 in a gap between the guide portion 22 b of the frame body 21 and the guide portion 22 b of the frame body 22, in a state of being provided with deflections by bending in the laminating direction. The ends of the sealing portion 7 are each clamped between the inner wall surface of the side wall portion 21 c of the frame body 21 and the outer wall surface of the side wall portion 22 c of the frame body 22, thereby fitting the frame bodies 21 and 22 to each other.
Compared with the case of the cell binder 20 in FIG. 6, in a cell binder 25 shown in FIG. 7, the area for accommodating the sealing portion 7 of the electric storage cell 5 is arcuately shaped. In the cell binder 25, the guide portions 21 b and 22 b are each arcuately shaped. The cell binder 25 accommodates the storage portion 6 of the electric storage cell 5 in an accommodating portion 26 a of a frame body 26 serving as a first frame body, and an accommodating portion 27 a of a frame body 27 serving as a second frame body, and further accommodates the sealing portion 7 of the electric storage cell 5 in a gap formed between an arcuate guide portion 26 b of the frame body 26 and an arcuate guide portion 27 b of the frame body 27, in a state of being provided with deflections by being arcuately bent in the laminating direction. The ends of the sealing portion 7 are each clamped between the inner wall surface of a side wall portion (wall surface portion) 26 c of the frame body 26 and the outer wall surface of a side wall portion (wall surface portion) 27 c of the frame body 27, thereby fitting the frame bodies 26 and 27 to each other.
In these cell binders 20 and 25, the bending amount of the sealing portion 7 of the electric storage cell 5 is low. Therefore, as compared with the cell binder 15, the cell binders 20 and 25 are somewhat small in the degree of tolerance for dimension error of the sealing portion 7, but can reduce the load upon the sealing portion 7.
As described above, the package structure of electric storage cells according to this embodiment is not a structure in which the storage portion 6 of the electric storage cell 5 and the sealing portion 7 are planarly pressed/clamped in the same direction (laminating direction), but a structure in which the storage portion 6 is pressed/clamped in the laminating direction, and in which the ends of the sealing portion 7 are each pressed/clamped by the wall surfaces in the direction substantially orthogonal to the laminating direction in a state where the sealing portion 7 is provided with deflections. This makes it possible to increase the shock resistance of the electric storage cells 5 while downsizing the package.

Claims (5)

1. A package structure of planar-shaped electric storage cells, the package structure being packaged by accommodating the planar-shaped electric storage cells, each of which has a storage portion and a sealing portion that seals the storage portion and is extendedly arranged around the storage portion, in frame bodies that are pressed together to surround the storage portion, the package structure comprising:
a first frame body for pressing the storage portion of one of the planar-shaped electric storage cells from one surface side thereof;
a second frame body opposed to the first frame body for pressing the one storage portion from the other side thereof; and
a holding structure provided between first wall surface portions of the first frame body and the second frame body, the holding structure being configured for accommodating the sealing portion in a deflected state and extending in the pressing direction of the frame bodies in a state where the ends of the sealing portion are clamped.
2. The package structure of electric storage cells according to claim 1, wherein the holding structure comprises a gap for accommodating a portion of the sealing portion in a bent state, and the first wall surface portions extend in the pressing direction of the frame bodies in a state where the ends of the sealing portion are clamped.
3. The package structure of electric storage cells according to claim 1, wherein second wall portions of the first frame body and the second frame body are arcuately-shaped and define the gap.
4. The package structure of electric storage cells according to claim 1, wherein second wall portions of the first frame body and the second frame body extend at an acute angle to the pressing direction of the frame bodies and define the gap.
5. The package structure of electric storage cells according to claim 1, wherein the sealing portion of each electric storage cell is integrated with and extends laterally away from the storage portion.
US11/719,784 2004-11-25 2005-11-24 Package structure of electric storage cells Expired - Fee Related US7682729B2 (en)

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JP2004341249A JP4926393B2 (en) 2004-11-25 2004-11-25 Storage cell package structure
PCT/JP2005/021569 WO2006057291A1 (en) 2004-11-25 2005-11-24 Package structure for electricity storage body cell

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